C++ headers Integrity check - follows #10065

[SSoulaimane]

No description provided.

[dlang-bot]

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Testing this PR locally

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[SSoulaimane]

I also added two missing virtual function declarations to make the added tests succeed.

[ibuclaw]

OK

[ibuclaw]

I also added two missing virtual function declarations to make the added tests succeed.

Good to see it caught more problems. :-)